The original image appeared this way in Photoshop see Figure 2. Note that we found a bug in Fireworks CS4 for the Mac. This dithered alpha dog will hunt. It didn't consistently apply an alpha transparency, while the Windows version worked fine. In some cases, the alpha transparency option in Fireworks for PNG8s allows you to overlay smooth transitions on top of backgrounds without resorting to PNG24 images.
Video: Dithered png image Image File Formats - JPEG, GIF, PNG
Browser dither can occur with GIF, PNG, or JPEG images. In Photoshop Elementsyou can control the amount of browser dither by shifting. As with the GIF format, you can choose the number of colors in an image and control how colors dither in a browser.
How To Optimize PNG — Smashing Magazine
The PNG‑8 format supports. We'll start with some essentials about the PNG format and will then move to of colors, it affects the dithering amount of different image areas.
The original image appeared this way in Photoshop see Figure 2. To display an image at low resolution while the full-resolution image is downloading, select Interlaced.
Quickly boost your ROI. Creates a custom color table by giving priority to colors for which the human eye has greater sensitivity. This dithered alpha dog will hunt.
Dithering in PNG files The Portable Freeware Collection Forums
With this original in hand you can reduce drop shadows and avoid requantizing a previously quantized image.
Images in other file formats, such as PNG, may also have such a restriction imposed on them for the sake of a reduction in file size. In most cases, PNG files from the same source images are smaller than Figure 4: PNG8 in Photoshop with Diffusion Transparency Dithering.
( × pixels, file size: An example of color dithering (dithered、optimized 16 color palette).
We put the front runners of the photo optimization pack through their paces. This color table usually produces images with the greatest color integrity. If the image contains transparency, select Transparency to preserve transparent pixels; deselect Transparency to fill fully and partially transparent pixels with the matte color.
Fireworks offers more options than Photoshop when optimizing PNG files.